Baelde, D., K. Chaudhuri, A. Gacek, D. Miller, G. Nadathur, A. Tiu, and Y. Wang. “Abella: A System for Reasoning about Relational Specifications”. Journal of Formalized Reasoning, vol. 7, no. 2, Jan. 2014, pp. 1-89, doi:10.6092/issn.1972-5787/4650.